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Physiochemical and functional properties of tiger puffer (Takifugu rubripes) skin gelatin as affected by extraction conditions.
International Journal of Biological Macromolecules 2018 April 2
The study investigated physiochemical and functional properties of gelatins from tiger puffer skin (GTPS) extracted with warm-water method at 45, 55 and 65°C for 3, 6 and 12h. GTPS45 exhibited strong γ-, β-, α1- and α2-chains, but they faded with the presence of fragments (<80KDa) in other GTPS. As the increase of temperature and time, amide I and A were shifted to higher wavenumber and their amplitudes in GTPS65-12 decreased. Lightness declined while redness and yellowness were enhanced. Gel strength was in a range of 144.5-79.8g, where it of GTPS45-3 was the highest while it of GTPS65-12 was the lowest (p<0.05), coincided with the longer relaxation time of T22 for immobilized water. Decline in gelling and melting temperature was observed when temperature and time increased. EAI and ESI increased as time prolonged or temperature climbed (p<0.05), in agreement with the form of emulsion droplet by microscopy. Both category and level of volatile compounds increased GTPS65-12 and 55-12 compared with those in GTPS45-12. Results suggest that temperature and time greatly affect the properties of GTPS. To ensure good properties, GTPS should be extracted at a temperature of 45-55°C for less than 12h.
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